Pulp-molding machine



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No. 459,174. Patented Sept; 8, 1891.

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PULP MOLDING' MACHINE.

No. 459,174. Patented Sept. 8, 1891.

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QEORGE D. KING, OF OSlVEGO, NElV YORK.

PULPMOLDl-NG MACHINE.

SPECIFICATION forming part of Letters Patent No. 459,174, datedSeptember 8, 1891.

Original application filed April 22, 1889, Serial No. 308,168 Dividedand this application filed February 24, 1891. Serial No.

- 382,452. (No model.)

To aZZ whom it may concern.-

Be it known that I, GEORGE D. KING, of Oswego, in the county of Oswego,in the State of New York, have invented new and useful Improvements inPulp-Moldin g Machines, of which the following, taken in connection withthe accompanying drawings, is a full, clear, and exact description.

This invention relates to the class of pulpmolding machines in which apervious or foraminated male die enters a solid female die or mold,which latter is provided with a piston connected to the base of said dieby an expansible rubber bag surrounding the male die when in operation.The pulp being introduced between the male die and the aforesaid rubberbag and piston and subjected to pressure of water admitted between thefemale die and rubber bag expresses the liquidfrom the pulp deposited onthe male die and presses the pulp into shape, the expressed liquidescaping through the perforations of the male die.

IIeretofore it has been customary to connect the pulp-induction pipe tothe piston of the female die, or arranged in such a manner as to depositthe pulp upon the male die from a point above the same. This arrangementhas proved to be defective in its operation, in that the inflowing pulpdrove the pulp away from the top of the male die, and therefore thelayer of pulp on top of said die was liable to be too thin and notsufficiently compact.

This application is a division of my application, Serial No. 308,168,filed April 22, 1889.

The chief object of this invention is to obviate the aforesaid defect;and to that end the invention consists in the attachment of thepulp-induction pipe to the male die and in the arrangement of a valvewhich controls the flow of pulp and when closed forms a part of saiddie, all as hereinafter more fully described, and specifically set forthin the claims.

In the annexed drawings, Figure 1 is a vertical longitudinal section ofa machine for forming bath-tubs and showing the same with the formedarticle between the dies or molds. Fig. 2 shows the same with the diesor molds separated from each other. Fig. 3 shows the same with the maledie inverted preparatory bath-tubs.

A denotes the hollow mold or female die,

and B the male die, designed for forming These dies are shown arrangedto be separated from each other in the same manner as described andshown in my prior application for patent, Serial No. 308,168, filedApril 22, 1889; but in this present case my invention is not limited toany specific arrangement of the aforesaid feature. The male die B isforaminous in the usual manner and covered with perforated sheet-brassor other suitable material, as shown at a, to allow free escape of theliquid from the pulp subjected to pressure between the two dies. Bymeans of bolts ff passing through a flange f on the baseof the femaledie and through a horizontal projection or flange 011 the base of themale die said dies are fastened to each other during the process ofcompressing the pulp into form.

In the female die is arranged the piston g, consisting of a stoutmetallic plate of the shape of the bottom of the bath-tub or article tobe formed. Said piston is guided by stems 7t 71, projecting verticallyfrom the top of the piston and through stufiing-boxes t t' on the topportion of the female die.

n denotes the rubber bag, which is usually employed in connection withthe piston and dies in this class of machines. Said rubber bag isattached at its upper edge between the marginal portions of the underside of the piston g and a plate g, fastened to said side of the piston,and the lower edge of the rubber bag is fastened to the flanges of thedie A.

0 denotes a pipe through which to introduce water under pressure betweenthe piston g and female die, said pipe tapping the die, preferably, nearthe center of its top, as shown.

a is the pulp-induction pipe, which I connect stationary to the lower ormale die at or near the center of the raised portion thereof for thepurpose of distributing the pulp as uniformly and as quickly aspossible, which is especially essential in the process of molding largearticles. The distribution of the pulp over the die is furtherfacilitated and accelerated by the delivery of the pulp direct from theend of the pipe. This inductionpipe is preferably, but not arbitrarily,at right angles to the part of the die to which it is attached; but inevery case the discharge end is to be permanentlyfiush with the innerside of the die. In said pipe is arranged a valve 12, preferably of theform of a tubular plunger, across the upper end of which is secured aperforated brass plate or other suitable strainer c to allowdrainagethrough the plunger and prevent loss of pulp.

Z is a lever by which to operate the plunger Z). The pulp is introducedunder pressure into the induction-pipe a by a branch pipe (I, tappingthe pipe a at its side and at a point to allow the plunger Z) to bemoved outward past the intersection of the said two pipes, and thusallow the pulp to pass into the pipe on in advance of the plunger. Theplunger has a stroke to carry the head thereof flush with the inner sideof the die, and thus formby the strainer c a part of the die when saidplunger or valve is in its closed position, as shown in Fig. at of thedrawings.

I do not herein claim the combination of the male and female dies,supports for said dies, and pivotal connections between the male'die andits supports, whereby said die is adapted to swin gin a vertical plane.Neither do I claim in this present application the combination, with thedies arranged as aforesaid, of the pulleys and cables or chainssupporting the dies, inasmuch as said combinations of elements areembodied in my prior application for patent, Serial No. 308,168, filedApril 22, 1889, of which this is a division.

hat I claim is 1. In a pulp-molding machine, the combination of apervious die on the surface of which the pulp is deposited, apulp-induction pipe for admitting pulp through said die, and a valveconnected to said induction-pipeto control the How of pulp and having apervious surface which when said valve is closed forms a portion of saiddie.

2. In combination with the male and female dies, the pulp-induction pipeattached to the male die and having its discharge end flush with theinner side of the said die, and a tubularvvalve in said induction-pipeand provided with a strainer across the end adjacent to the male die,substantially as described.

3. In combination with the inverted female die and male die, thepulp-induction pipe (1, connected to the center of the .male die, thetubular valve 1) in said pipe, the strainer c on the head of the valve,the lever Z for operatin g the valve, and the pulp-conduit cl, tappingthe side of the pipe a, substantially as described.

In testimony whereof I have hereunto signed my name this 3d day ofOctober, 1890.

GEORGE D. KING. [L. s]

Witnesses.

llIARK W. DEWEY, H. M. SEAMANs.

